Class E Cargo Compartment Smoke Detection and Active ULD Testing

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Class E Cargo Compartment Smoke Detection and
Active ULD Testing
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Cockpit Voice Recorder Transcript1 233344
Aircraft cleared to descend from FL 330 to FL
240 233439 Smell like wood burning 233540
Its pretty strong now 233554 Cockpit door
opened Its more in the back 233839 One pack
turned off 234318 Fume evacuation 234327
Packs on max flow, recirc fan off 234759
Cockpit door opened again Its definitely
stronger in the back. No haze or smoke when I
shined my light back there At FL 40 235442
Cargo smoke detectors on At FL 20 235548
Landing gear down 235557 Lower cargo
compartment aft smoke detectors on 235900
Touch down 235902 Smoke in cockpit 235945
End of transcript. Crew evacuated through L1
door 1 Source NTSB Accident Report
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NTSB Recommendation A-07-98 to the FAA. Ensure
that the performance requirements for smoke and
fire detection systems account for the effects of
cargo and cargo containers on airflow around the
detection sensors and on the containment of smoke
from a fire inside a container and should
establish standardized methods of demonstrating
compliance with those requirements. (A-07-98)
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727 Freighter
Main Deck Airflow approximately one air change
every 5.1 minutes (11.8 air changes/hour). Air
from one pack supplied with APU bleed air.
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4 Aspirated Photoelectric Smoke Detectors (94-96
light transmission/ft alarm point)
Certified to one minute detection time (FAR
25.858)
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747SP Below Floor Compartment
Ventilation airflow provided one air change
approximately every 6 minutes (10 air changes per
hour). Air source was 2 air conditioning packs
supplied with bleed air from the APU
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2 Aspirated photoelectric smoke detectors.
Calibrated to alarm at 90.6 /- 1 percent light
transmission per foot.
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747 Time of Initial Alarm Regardless of Duration
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747 Time of Initial Alarm Regardless of
Duration Average detection time for all positions
tested is 13 seconds faster for the fully loaded
compartment.
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Simulated Refrigerated ULD
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Position 1L
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Position 3L
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Position 5R
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Position 4R
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Draft report has been submitted for publishing
and will be available on the Fire Safety website
shortly.